Abstract

We investigate the dynamics of the carrier-envelope-offset (CEO) frequency,
fCEO, controlled by a pump current on the
self-referencing of an optical frequency comb generated from a diode-pumped
solid-state laser at 1.56 μm. We observe a reversal point in the
tuning of fCEO with the pump current. Between the low- and
high-frequency region in the dynamic response of fCEO to pump current modulation, we observe a
significant phase shift of ≈180deg in the transfer function. As a result, it is
impossible to stabilize fCEO at a pump current above the reversal point,
although the free-running CEO beat at this point has a higher signal-to-noise
ratio than underneath the reversal point at which the locking is
straightforward. Our results indicate that a high signal-to-noise ratio and a
low-noise CEO beat are not sufficient indicators for the feasibility of comb
self-referencing in cases for which CEO dynamics play a dominant role.

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